<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <div>
      <input type="text" placeholder="请输入身高(米)" v-model="h">
      <input type="text" placeholder="请输入体重(公斤)" v-model="w">
      <input type="button" value="提交" @click="f1()">
      <h2>{{info}}</h2>
  </div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
  let v = new Vue({
    el:"body>div",
    data:{
      info:"",
      h:"",
      w:"",
    },
    methods:{
      f1(){
        axios.get("/bmi?h="+v.h+"&w="+v.w).then(function (response) {
          v.info=response.data;
        })
      }
    }
  })
</script>
</body>
</html>